Generate code coverage reports on PRs

.github/workflows/nodejs.yml

@@ -19,8 +19,13 @@ jobs:
         node-version: [18.x]
         mongodb-version: [4.4]
 
+    permissions:
+      pull-requests: write
+
     steps:
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+      with:
+        fetch-depth: 0
 
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v4
@@ -36,5 +41,35 @@ jobs:
       run: npm i
 
     - name: Test
-      run: npm test
+      id: test
+      run: |
+        npm run test-coverage-ci || echo "Silently ignoring coverage threshold limit..."
+
+    - name: Check if a valid lcov.info file is generated
+      id: check-lcov-non-empty
+      run: |
+        if [ -s "./coverage/lcov.info" ]; then
+          echo "lcov.info is not empty."
+          echo "isNotEmpty=true" >> $GITHUB_OUTPUT
+        else
+          echo "lcov.info is empty."
+          echo "isNotEmpty=false" >> $GITHUB_OUTPUT
+        fi
+
+    - name: Install LCOV
+      if: ${{ steps.check-lcov-non-empty.outputs.isNotEmpty == 'true'}}
+      run: |
+        sudo apt-get update && sudo apt-get install --assume-yes lcov
+
+    - name: Report code coverage
+      if: ${{ steps.check-lcov-non-empty.outputs.isNotEmpty == 'true' }}
+      uses: zgosalvez/github-actions-report-lcov@v3
+      with:
+        coverage-files: ./coverage/lcov.info
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        update-comment: true
+
+    # - name: Exit if coverage condition not met
+    #   if: ${{ steps.test.outputs.exit_code }} != 0
+    #   run: exit ${{ steps.test.outputs.exit_code }}
 

nyc.config.js

@@ -0,0 +1,41 @@
+/* eslint-disable max-len */
+'use strict';
+
+const { execFileSync } = require('child_process');
+
+let opts = {
+  branches: 80,
+  lines: 80,
+  functions: 80,
+  statements: 80,
+};
+
+// Only generate coverage report for changed files in PR
+// see: https://github.com/actions/checkout/issues/438#issuecomment-1446882066
+//      https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables
+if (process.env.GITHUB_BASE_REF !== undefined) {
+  console.log('Generating coverage report for changed files...');
+  try {
+    const baseRef = execFileSync('git', [
+      'rev-parse',
+      `origin/${process.env.GITHUB_BASE_REF}`,
+    ])
+      .toString()
+      .replace('\n', '');
+    const headRef = process.env.GITHUB_SHA;
+    const stdout = execFileSync('git', [
+      'diff',
+      '--name-only',
+      `${baseRef}..${headRef}`,
+    ]).toString();
+    opts = {
+      ...opts,
+      include: stdout.split('\n'),
+    };
+  } catch (error) {
+    console.log('Error: ', error);
+  }
+}
+
+console.log('nyc config: ', opts);
+module.exports = opts;